Cabinet or furniture clamp



I L. NYGREN.

CABINET 08 FURNITURE CLAMP.

APPLICATION FILED APR, 11, 1920.

1,369,533. Patented Feb. 22,1921.

JNVENTOR.

A TTORN E YS.

UNITED STATES PATENT OFFICE.

LEANDER NYGREN, or BIRMINGHAM, ALABAMA.

, CABINET on FURNITURE CLAMP.

a, Application filed April 17, 1920. Serial No. 374,543.

ture together when glued, and so as to hold the sections in rigid position until the glue sets. 7

The prime objects of the invention are to provide a simple, efilcient and durable device of this character; which will prevent the buckling of the boards held in the clamp, and which may be readily adapted to the many various uses to which such a clamp may be put.

In the drawings:

Figure 1 is a perspective view, showing the clamp in use for holding two boards together in set position.

Fig. 2 is an elevation of the device itself.

Fig. 3 is a medial, horizontal section through the tail piece.

Fig. 4: is a detail of the locking mechanism of the tail piece.

Fig. 5 is a plan view of the pressure bar.

Fig. 6 is a plan view of the top bar.

In carrying out the invention in its preferred form, as illustrated in the said drawings, I provide two side bars 1, suitably spaced apart and extended parallel one to the other. At the top of these bars I detachably mount the transverse top bar 2. For this purpose the top bar 2 is bored out at each end to form the sockets 3, and these sockets are screw-threaded, as shown at 4, and thus adapted to receive and threadedly engage the upper ends of the side bars 1, these bars being likewise screw threaded as shown at 5 so as to engage the sockets 3. The top bar 2 is likewise pierced with a central bore 6 which is also screw threaded, as shown at 7, and thus adapted to receive and threadedly engage the pressure screw 8 which has the crank 9 rigidly mounted at the outer end. The inner end of the pressure screw 8 is journaled in the transverse pressure bar 10, which is slidingly mounted upon the side bars 1, the side bars 1 passing Specification of Letters Patent.

Patented Feb122, 1921.

freelythrough the bores 11 formed one at each end of the pressure bar 10. The journal 12 at the inner end of the pressure screw 8 is provided with an annular recess 13 and a set screw 14 passing through the side of the pressure bar 10 engages at its inner end the recess 13, thus holding the pressure bar rotatably locked to the pressure screw 8. A

transverse tail piece 15 is provided, same consisting of a loop of heavy iron 16 bent around and inclosing the side bars 1 and thus adapted to slide thereupon. Within the loop 16 are slidingly mounted two lock dogs 17 which are adapted to slide laterally and engage, one at either side, the side bars 1. These dogs 17 carry each a slot 25 at its inner end which aline with and open into each other and by means of which they are freely mounted over a wedge shaped lock spreader 18. This spreader 18 is slidingly mounted transversely through the loop 16, said loop for this purpose being pierced with a slot 19 at one side and with a hole 20 at the other side. A cam-shaped, inclined recess 21 is chambered in the loop 16 around the hole 20, and is provided with a notch 22. A locking cam lever 23 is loosely mounted upon the outer extended end 24 of the looking spreader 18, the end 24 passing freely through the hole 30 formed through the end of the lever. A nut 31 secures the lever in place. The inner end of the lever 23 may be dished or stepped to one side so as to allow the handle to swing clear of the apparatus, and the inner face of the dished end is provided with a cam-shaped inclined shoulder 27 complementary to the recess 21 and adapted to work therein. Thus, by rotating the lever 23 clockwise, the cam shoulder 27 slides up the cam recess 21, drawing the spreader 18 inwardly, and spreading the dogs 17 outwardly against the side bars 1, so as to lock the tail-piece 15 securely to the side bars 1, in any desired position. Retractile springs 28 normally tend to hold the dogs 17 in contracted position. A pressure plate 29 may be mounted upon the lower side of the pressure bar 10, and another upon the upper side of the tail piece 15, as means for preventing the crushing of the wood.

The operation of the device is apparent. The screw 8 is turned upward to its topmost position. The boards 24 after being properly glued are thrust between the side bars 1, after which the tail piece 15 is forced up against the boards and the cam lever 23 is turned sidewise so as to lock the tail piece 15 firmly in position upon the side bars 1. Thus the boards 24: are held in set position until the glue hardens. The side bars 1 prevent the boards 24 from buckling. Any desired pressure may be brought upon the boards 24 by merely turning the crank 9.

While I have herein described a certain specific method of constructing and assembling the elements of my invention, it is understood same may be varied in minor details, not departing from the spirit of my invention as defined in the appended claim. What I claim to be new and patentable is:

A cabinet clamp comprising two spaced and parallel side bars; a transverse top bar detachably engaging the upper ends of the side bars through threaded sockets formed in the ends of the top-bar; a central, threaded, pressure screw bore formed through the top bar midway between and parallel to the sockets of the top bar; a pressure screw passing through and threadedly engaging said bore; a crank rigidly mounted at the top end of said pressure screw;' a transverse pressure bar journaled at the lower end of said pressure screw, so as to travel with the screw, the side bars being slidingly mounted through bores piercing the ends of the tail piece; and a loop shaped tail piece enopposite side, a cam-shaped, inclined recess chambered around the outer side of the hole,

a narrow wedge-shaped lock spreader freely mounted through said slot and having its small end rounded and extended loosely out through said hole, two laterally expansible lock-dogs carrying alined, connected slots at their ends whereby they are freely mounted over said lock spreader and adapted thereby to be expanded laterally against the side bars, a spring mountedwithin each slot of each lock dog as means for holding the dogs normally contracted, a locking lever having its inner end stepped sidewise and a hole formed therethrough whereby the lever is freely mounted upon the'small extended end of the lock spreader, and a cam-shaped, inclined shoulder formed on the inner face of the stepped end of the lever, complementary to and adapted to workin the said camshaped recess, whereby the rotation of the lever draws the lock spreader inwardly, causing the lock dogs to impinge the side bars. V

LEANDER NYGREN. Witnesses:

J. W. LACEY, C. O. NELSON. 

